NDLI: Impact melt differentiation in the South Pole-Aitken basin: Some observations and speculations

Content Provider	Semantic Scholar
Author	Vaughan, William M. Head, James W.
Copyright Year	2014
Abstract	Abstract The stratigraphy of the South-Pole Aitken basin (SPA) interior is consistent with that of a massive impact melt sheet that differentiated to form cumulates. Spectroscopic and geophysical constraints on the stratigraphy of SPA suggest a ~12.5 km thick layer of norite above ultramafic pyroxenite and dunite layers. A similar stratigraphy is produced from differentiation by crystal settling of a ~50 km thick impact melt sheet (lunar impact melt sheets >10 km thick likely undergo differentiation by crystal settling) formed by an oblique impact (and thus containing ~20 vol. % crustal material). We propose that impact melt differentiation can account for geophysical (nonzero crustal thickness) and geochemical (~2 ppm Th) anomalies in SPA.
Starting Page	101
Ending Page	106
Page Count	6
File Format	PDF HTM / HTML
DOI	10.1016/j.pss.2013.11.010
Alternate Webpage(s)	http://www.planetary.brown.edu/pdfs/4543.pdf
Alternate Webpage(s)	https://doi.org/10.1016/j.pss.2013.11.010
Volume Number	91
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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